Exercise 7.02

Page 155

Write a program that will print arbitrary input in a sensible way. As a minimum, it should print non-graphic characters in octal or hexadecimal according to local custom, and break long text lines.

#include <stdio.h>
#include <string.h>
#include <ctype.h>

#define MIN_CHAR ' '
#define MAX_CHAR '~'
#define WRAP_LEN 10
#define MAX_BUF 1000

int main()
{
	int c;
	char line_buf[MAX_BUF];
	char *line_ptr = line_buf;
	char word_buf[MAX_BUF];
	char *word_ptr = word_buf;

	while ((c = *word_ptr++ = getchar()) != EOF) {
		if (isspace(c)) {
			*word_ptr = '\0';
			strcpy(line_ptr, word_buf);
			line_ptr += word_ptr - word_buf;
			word_ptr = word_buf;
		} else if (c < MIN_CHAR || c > MAX_CHAR) {
			--word_ptr;
			word_ptr += sprintf(word_ptr, "0x%x", c);
		}
		if (c == '\n' ||
		    line_ptr - line_buf + word_ptr - word_buf > WRAP_LEN) {
			if (line_ptr - line_buf > 0 && c != '\n') {
				*line_ptr++ = '\n';
			}
			*line_ptr = '\0';
			printf("%s", line_buf);
			line_ptr = line_buf;
		}
	}
}